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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df88b9ceb499946ba8df51d80d1f437ff70d147c53c3cd097148829c45ff9da' 
  AND token = 'Ub8J4uJnlMkUx5wKXWyQ38sgONBkC1X4FOQTqpH7qQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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