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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aa6acb948e33cb6c608a81227d0bff49e14bcec1712c194b467abdf26245b5' 
  AND token = 'm8PVn5EgGYWRPYx9GCZNr5mDxT7k3NaNYWESxwjKpEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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