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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa943c54e3f9c26cbc8e18043463dbfae069d3d4a565ce875fc5c40a9398206' 
  AND token = 'LqQ7c7YBLkwFgcH1edBsMigECDItSJxKoQQYQ8tRXKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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