SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f066851adff193b6c6b0b830a6e369b1724db91899463fef02873a4fa3aad0' 
  AND token = 'jmjT/Nz1UeV8Kw5pNt6Pj2FjdkBLh2vu0l551+M8ZOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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