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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089574f21d6851a5d1be14e160d457da4519815b9a32999c4d001ff96c108515' 
  AND token = 'X9YZK271Cex2KBnWvumUn7GJcNj7igEejbrF3caXyRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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