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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7284a1987eeb11a516e8e54fb4e181efd9b3c2e4095eae774981bbe90182b4' 
  AND token = 'bwo3FWUBoYBvy9aPy6DztbVzKqE8EUhdR9J9gzBHK58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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