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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf865133026ba5a9baa8e9be35eaafe325e25634bb0eb90ff0c7e60f78d5e38' 
  AND token = 'AN722y/euQ2xqTYRrF8qlD+/p4slidOe1ISVR9Wc/a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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