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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa223c5b203d6c676378aab65cd1620ddae8f9d439dcd2a836bfef041a9868e' 
  AND token = 'PzbXJ4FH0LJChlu/yf/B05YHN7IfsD7Cd0lUMWS1UWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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