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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec16fb7edd4fda3610f8ec91b6a53d91cb6d2ae648b8bb2d319a1b09d6946edc' 
  AND token = 'AHJK7iSEAxEt4aW+ivtnr3v89c/Y9Dq0D32Anagpwrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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