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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57c41b0813699eb1d8e20ba18078fbe2e3562fd9ba3892d407832bfc3b46a4c' 
  AND token = 'OZd1FntHVkOTqaT4IRfUdyWdGqRCOPJm+/0GmWUOQ9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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