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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeff484efec95177b1948a7f0930411e0bf69e93671f94bfb49c4fbe5b352da' 
  AND token = 'sQinRRWiq80+ekYg5Gf03M+osWtLg55axm2+W+8qYSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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