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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d279613fdbc576acc511d7c12bf3961fb511bc1fd7a6dbe74b2e61d1d67dae' 
  AND token = 'xGD8r2szRwNJ+djRn+L7nEawU72HRfF59oqYFK2Lt4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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