Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ab549f19a97a8637e07d85314a91e3b010b9a50ebeb7762ef5616201b2a288' 
  AND token = 'WpkEB9GthlS7c4AEpFRBLb1+lqBoJppPIPsPLfPlJk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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