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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c47494c1101c7d8cd98b49843cf7772bcd3d246a17c9ce5344e122a72831f8' 
  AND token = 'MvYfsv0O9db6R8nk2AUs8DDLinCRTiFkkWzzo4XVvhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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