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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e832420400efe3e9c3612c1322b1607824ec94de1b045dce81e44d648ce260' 
  AND token = '8paniZ+haeXyj0XAadzkIpc3W70bhSUBhxjsb7pa83A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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