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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1b8410a79f9638a7d884929efd3b9f6043ae91c4cf3a54cb96bdadca698c54' 
  AND token = 'SqnAm+Eo1rK6VPQ6llZZlmFKGVk0A0T2F2ezqo7vF/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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