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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ac453cdec5baee49f8901357079eb1ba1a309dbc0d6cf08256ca46fe5c4be5' 
  AND token = 'Q8S2DDo3EGq7JjPkDKVPwtAjr2tndYtmdCVc1gaDtb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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