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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f6dd2e8c86495056ecc06f6532141e8ee7e181066cfe498d64256ac79d0bac' 
  AND token = 'JCjxBMLceW0EqKXwzenBAvfN8KeLj9BOeQvFsF2BVsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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