SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a7662c5945108e7fffd4d7511e2b49ff50fb891d55d18dfba23da2fc0a62f0' 
  AND token = 'GU/wGpMpJespQr31LurePh98Vr1JWcRFxvsTWYmvFCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01088

JSON explain

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