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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19777220779435496299b2d8baa7a02b24b2e41798922fd16a8b4ca975a56f32' 
  AND token = 'N7JxrGhPNF1ljaznoc45HMh3qOeCVmeZjmwzA8wnMCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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