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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9294639871604208d1a317cd78dd7113db66d5ab9bbe9a68125b6e750bdfb4e' 
  AND token = 'ZfaC7CFf0rvidfUxPwwLTrxJljIkZEGkwCRM9gU1KaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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