SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e210aae899fa8cf97d01124083d23b7df221cf4816bdcd5d0e1321dc73e0764' 
  AND token = '8x3mFUXvQFUPa5vLzDL5wslV6qbcYrFxz8rvUgEjZq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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