SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b8829a89c88c2d2316fb473d892a22c1bf5e845f65c6c54452d07e6724f5c3' 
  AND token = 'yNMkFPqiGX5jbzwHZpPCK7O+9xAFswHMxZg62P4rpIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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