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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd394b2da4634172dd5553ae598a75ab8b49bcb97cc9c892b788bf936b4b45e' 
  AND token = '3U3UG0oraSIFSn/CGfWa+t9WUnNRRNzZQ9mlxqfSj4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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