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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1cf59d86ab5920266e9838edbe7c54ab4d5269b2dce7b0ac8fb772eca0112e' 
  AND token = 'zvvYHsYwMIzwqDvltycPmKWruyMLo7yvUtipzFnHzxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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