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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f41263f678e81cb78f2a925c6d1a8351e151605b5d5e22adf6ac5e991aaae7' 
  AND token = '/SDdQT0DQsMgbbbkPBnICnb1IT7/HO/tb3Tr4VsFs5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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