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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4299185d9956fbba219803769f3950e464dc5b2c2fbfade42d2a62e3428cec' 
  AND token = 'khSaMaHcfdEFzSJo0flv002Z9WTzo1L6x7c0bi7K78A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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