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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30a5a66115a0a334648819c845c3235014b7a8807a98ee2b6590692c5c2a996' 
  AND token = '3NweTXIKXw4aacxQe2sWoqaFb0JlpQ76lDIqgNPsPy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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