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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a737b2fe9bf5bc13c6542efdd8781996e122413ac9d9e3bdc996f4c45e540f5a' 
  AND token = 'QUtYjmw63J8WmQhlotjUJiXCC1OayLILku9mEmtfgB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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