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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad85c949c99bae7ef4e99483540ce63c435cf9583363e9d15853a9ceb202c0a3' 
  AND token = 'BTz+uxSmp7edAgpD9fkOhEJ4ncBLtEQtWzagr6offQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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