SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b4ea3419f292d7b66db9568cd7c733089117e0f6634874621f80005dc97a37' 
  AND token = 'MVmSWplc86FOhlOZS57L1pYhlAHv8CmpSUSNt/cuzqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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