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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aced8431c56e8583ee8aeea75fcddc642fe862e09c636f7bda6c4627e7179982' 
  AND token = 'r7F5PlLtgkTelzJ2ldyU2MQbvyaTRXsLKp8yP2HFUMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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