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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee88433263d954272b3174e365996b7731a167c401e10ced604a058855506f67' 
  AND token = 'Rtr61CjzlMnTgq9QjuCq6HA5jiwM2dyEw8x0DuHwC6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}