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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681b13b8fdde53b8528699646ec2acbe5ae1ad2ee15618ccbdf78f6af79c5679' 
  AND token = 'XYGxclI3nNqGAleoj/ZtWtOcUVwScgqE3TVpF6hEZ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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