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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af895026709a5ac0207a053a9b423fe0f41999b690ba1e9c041f97bbd0838d8a' 
  AND token = '1smsqwvIxjmQw7rh6/JyHMkWQirmnnCy43ZYRd472HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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