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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c921bd7ab8f34be6c85056946a3aad6c60b980aac4bb14221def57594e6a68' 
  AND token = '8jexoWeS2a8xfUujyqhXRexsjF7Z+jYWJQUmTomb2JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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