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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ff4d19cb530ecfa51b5fa04698017f9d822e38fbf2ec00e6f3e9cce5c393ce' 
  AND token = 'L90feiQRgAQ+3IHRatW/AOV91TEFwzUztTRKsNTw24E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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