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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092b980320a937ace009fdec01a74035b3f73620beedf9364e8764d618af81cc' 
  AND token = 'FOgu1G/7f2WqkNKTvtjreNKV8Ng3vsEkEOeLkzlOJVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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