SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7b1a6c95e3f77602bc6a09936389cb4fe28c01d04752afd5f66ad928973a4e' 
  AND token = '9ZCTST+LfmW4U8GZp0qb/WlM8oiKqViCwPuAXgB33KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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