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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f0042f72804e7b90981c05e4d4bfddc81d3003ab022a8d0b08073e011f2921' 
  AND token = 'Na8OuabaAV+M7gu+DKY3pvSs+2ffilssSHqDF0XKl8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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