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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968191a3f20a57600dbb7622934e192be27b602d2f331a7b662f8fc3374ca62c' 
  AND token = 'UGo1ySyBRLXCsqVCguMuxDK6LGMNv69okimcZZ9seoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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