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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69a58cf7196123696ec39a3d62bf6738110b6ce8540e7640fed7f6c75c1b61f' 
  AND token = 'dcKStD2UJJsLUhV4AcOeHdWU9lkF/bzykcTUbILruxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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