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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b22eea81641ca378dcf515a130fc1084dc2232a127d04e56ebe69e07d82719d' 
  AND token = 'XK06tkazymTt9a6DkNXoJqTUSh5H2X6d/Kwu5kmGVug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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