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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f33500f86ab0fe3ae49d85c8d18d9cdf2b85062377a7c19e34ca91561e76f5' 
  AND token = 'Ehu3O9brNHqZaUllzzxTj9g3SrRuiZ/iEbcJZsduzVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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