SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfdc6eb3daf4cf828cce5fe67dcf988caf77c9d7c0e3f72c69ba3d1ccb213a7' 
  AND token = 'jhgXCDF3BGHDywN/SmtPYLRvtsqhbo5qBXS2jl2nNiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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